Chemistry - Pblock Elements Xi - Quiz-2

${({si}_{2} O_{5})}_{n}^{2 n -}$ anion is obtained when :

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() no oxygen of a ${SiO}_{4}^{4 -}$ tetrahedron is shared with another ${SiO}_{4}^{4 -}$ tetrahedron
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() one oxygen of a ${SiO}_{4}^{4 -}$ tetrahedron is shared with another ${SiO}_{4}^{4 -}$ tetrahedron
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() two oxygen of a ${SiO}_{4}^{4 -}$ tetrahedron is shared with another ${SiO}_{4}^{4 -}$ tetrahedron
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() three oxygen of a ${SiO}_{4}^{4 -}$ tetrahedron is shared with another ${SiO}_{4}^{4 -}$ tetrahedron

Amphibole silicate structure has 'x' number of corner shared per tetrahedon. The value of 'x' is :

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() $2$
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() $2 \frac{1}{2}$
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() $3$
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() $4$

In which of the following silicates, only two corners per tetrahedron are shared?

(i) Pyro silicate (ii) Cyclic silicate

(iii) Double chain silicate (iv) Single chain silicate

(v) 3D silicate (vi) Sheet silicate

Options are as follows :

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(i), (ii), and (v)
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(iv) and (vi) only
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(i) and (vi) only
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(ii) and (iv) only

The correct code for stability of oxidation states for given cations is :

(a) ${Pb}^{2 +} > {Pb}^{4 +}, {Bi}^{3 +} > {Bi}^{5 +}$ (b) ${Tl}^{3 +} < {In}^{3 +}, {Sn}^{2 +} > {Sn}^{4 +}$

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(a) and (b)
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(a), (b) and (c)
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(a) and (c)
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(b) and (d)

Metal protected by a layer of its own oxide is:

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Al
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Ag
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Au
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Cu

On heating Al at $800 ° C$ in air, ${Al}_{2} O_{3}$ is formed. The reaction is:

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an endothermic reaction
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an exothermic reaction
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reduction of aluminium
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none of the above

Alumina on heating with carbon in nitrogen atmosphere gives:

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$Al + CO$
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$Al + {CO}_{2}$
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$AlN + CO$
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$Al + CO + N_{2}$

Hoope's process is used in the refining of:

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Al
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Zn
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Ag
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Cu

The correct order of decreasing hardness of the following compounds is:

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Diamond > Borazon > Carborundum > Corundum
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Borazon > Diamond > Carborundum > Corundum
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Corundum > Carborundum > Borazon > Diamond
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none of the above

Aluminium becomes passive in nitric acid because it-

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Is a noble metal
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Forms a thin film of oxide
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Has a positive reduction potential
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None of the above

Chemically thermite is -

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Fe and Al
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Ferric oxide and aluminium powder
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Barium peroxide and magnesium powder
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Cu and aluminium

${Al}_{2} O_{3}$ formation involves large quantity of heat evolution which makes its use in:

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deoxidizer
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confectionary
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indoor photography
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thermite welding

Al and Ga have the same covalent radii because of:

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Greater shielding power of s-electrons of Ga atoms
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Poor shielding power of s-electrons of Ga atoms
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Poor shielding power of d-electrons of Ga atoms
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Greater shielding power of d-electrons of Ga atoms

Which is used as mordant?

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${AlCl}_{3}$
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${Al}_{2} {({SO}_{4})}_{3}$
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$Alum$
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${Al}_{2} O_{3}$

Hybridisation of boron in diborane is:

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$sp$
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${sp}^{2}$
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${sp}^{3}$
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${sp}^{3} d^{2}$

The blue coloured mineral 'Lapis Lazuli' used as semi precious stone is:

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prussian blue
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basic copper carbonate
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sodium alumino silicate
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zinc cobaltate

Red liquor is:

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${({CH}_{3} COO)}_{3} Al$
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$Al {(OH)}_{3}$
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${Al}_{2} {({CO}_{3})}_{3}$
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${Al}_{2} {({SO}_{4})}_{3}$

Boron carbide, $B_{4} C$ is widely used for:

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making acetylene
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making plaster of Paris
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as a hardest substance after diamond
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making boric acid

Which one is explosive?

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${PCl}_{5}$
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$Pb {({NO}_{3})}_{2}$
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${NH}_{4} {NO}_{3} + Al powder$
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$C_{6} H_{5} {NO}_{2}$

${BCl}_{3}$ does not exist as dimer but ${BH}_{3}$ exist as dimer $(B_{2} H_{6})$ because:

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chlorine is more electronegative than hydrogen
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there is $pπ - pπ$ back bonding in ${BCl}_{3}$ but ${BH}_{3}$ does not contain such multiple bonding
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large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms
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none of the above

Which of the following imparts green colour to flame?

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$B {(OMe)}_{3}$
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$Na (OMe)$
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$Al {({OBr}_{2})}_{3}$
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$Sn {(OH)}_{2}$

Borax bead test is responded by:

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Divalent metals
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Heavy metals
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Light metals
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Metal which forms coloured metaborates

Reactivity of borazole is greater than that of benzene because:

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borazole is non-polar compound
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borazole is polar compound
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borazole is electron deficient compound
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of localized electron in it

Inorganic benzene is:

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$BN$
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${BF}_{4}$
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$B_{2} H_{6}$
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$B_{3} N_{3} H_{6}$

Diborane does not undergo cleavage reaction with:

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trimethyl amine
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ammonia
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$CO$
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${CO}_{2}$

Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that ${BF}_{3}$ has no dipole moment but ${PF}_{3}$ has?

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${BF}_{3}$ is spherically symmetrical, ${PF}_{3}$ is not
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${BF}_{3}$ molecule must be linear
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The atomic radius of P is larger than the atomic radius of B
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The ${BF}_{3}$ molecule must be planar triangular

${Mg}_{2} C_{3}$ has the following characteristics:

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It is called magnesium allylide
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It contains ${Mg}^{2 +}$ and $C_{3}^{4 -}$ ions
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It on hydrolysis gives propyne
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All of the above

$CO$ reacts with chlorine in presence of sunlight to give:

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${CCl}_{4}$
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${COCl}_{2}$
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${CO}_{2}$
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${CHCl}_{3}$

Chrome yellow is:

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${PbCrO}_{4}$
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$K_{2} {Cr}_{2} O_{7}$
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${PbMoO}_{4}$
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${Pb}_{3} O_{4}$

Litharge is:

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$PbO$
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${PbO}_{2}$
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${Pb}_{3} O_{4}$
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$Pb {({CH}_{3} COO)}_{2}$

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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